When a virtual warehouse in Snowflake is resized, specifically when it is increased in size, the additional compute resources become immediately available to all running and queued queries. This means that the performance of these queries can improve due to the increased resources. Conversely, when the size of a warehouse is reduced, the compute resources are not removed until they are no longer being used by any current operations1.
References:
* [COF-C02] SnowPro Core Certification Exam Study Guide
* Snowflake Documentation on Virtual Warehouses2

To utilize the search optimization service in Snowflake, the correct syntax for granting privileges to a role involves specific commands that include adding search optimization capabilities:
* Option C: GRANT ADD SEARCH OPTIMIZATION ON SCHEMA <schema_name> TO ROLE
<role>. This command grants the specified role the ability to implement search optimization at the schema level, which is essential for enhancing search capabilities within that schema.
Options A and B do not include the correct verb "ADD," which is necessary for this specific type of grant command in Snowflake. Option D incorrectly mentions the database level, as search optimization privileges are typically configured at the schema level, not the database level.References: Snowflake documentation on the use of GRANT statements for configuring search optimization.